JP6796704B2 - Container inspection device and container inspection method - Google Patents

Description

The present invention relates to a container inspection device and a container inspection method.

As a method for detecting thin bubbles generated extremely rarely on the inner surface of a container, particularly a glass bottle, there is an inspection method previously proposed by the applicant (Patent Document 1).

The thin bubbles are generated on the inner surface of the glass bottle and are formed of a dent that is extremely shallow with respect to the inner surface and a thin glass film that covers the dent. In this inspection method, in order to detect thin bubbles, a fringe filter in which a plurality of horizontally long slits are provided in multiple stages at regular intervals on an opaque plate is used to transmit light only at the slits and pass through the thin bubbles. The image is taken as an image in which the width of light and dark is vertically compressed by the light.

Even with this method, it is possible to detect thin bubbles, but shadows due to thin bubbles, light and darkness due to uneven wall thickness of the glass bottle, and seams of the glass bottle (molded at the seams of the mold). It was difficult to distinguish between light and dark due to the step). Therefore, even a non-defective glass bottle is often determined as a defective product, and it is desired to reduce the non-defective product exclusion rate.

In addition, the applicant has proposed an inspection device that detects defects such as wrinkles in a glass bottle using a light control film (Patent Document 2). It was difficult for this inspection device to detect thin bubbles in extremely shallow depressions on the inner surface.

Special Fair 7-11490 Japanese Unexamined Patent Publication No. 2013-134185

An object of the present invention is to provide a container inspection apparatus and inspection method capable of inspecting the presence or absence of defects such as thin bubbles having an unclear outline.

The present invention has been made to solve at least a part of the above-mentioned problems, and can be realized as the following aspects or application examples.

[Application example 1]
The container inspection device according to this application example is
A light emitting part having a light emitting surface that irradiates the container with light,
An imaging unit arranged so as to face the light emitting unit with the container in between,
A determination unit that determines the presence or absence of defects based on the image of the container captured by the imaging unit, and
A light limiting unit arranged on the container side of the light emitting unit and
Including
The light limiting portion includes a light transmitting portion and a dimming portion extending in the horizontal direction along the light emitting surface.
The light transmitting portion and the dimming portion are alternately arranged in the vertical direction.
The light transmitting unit transmits the light emitted from the light emitting unit to the container side, and the light transmitting unit transmits the light emitted from the light emitting unit to the container side.
The dimming unit includes a plurality of blinds extending in the horizontal direction in the vertical direction, and limits the incident angle of the light emitted from the light emitting unit with respect to the vertical direction .
The vertical width of the light transmitting portion is 3 mm to 6 mm, and is wider than the distance between the blinds adjacent to each other in the dimming portion .

According to this application example, it is possible to inspect the presence or absence of defects such as thin bubbles with unclear contours due to changes in the brightness of the container surface in the vertical direction due to the light transmitting portion and the dimming portion. According to this application example, it is possible to recognize the shadow of the contour of a defect such as a thin bubble having an unclear contour.

[Application example 2]
In the container inspection device according to this application example
The dimming portion is arranged on the light emitting surface of the light emitting portion, and the height from the light emitting surface can be 0 mm to 100 mm.

According to this application example, in the captured image, the shadow of the seam can be suppressed and the shadow of a defect such as a thin bubble having an unclear outline can be emphasized.

[Application example 3 ]
In the container inspection device according to this application example
The dimming portion can be formed by stacking a plurality of light control films.

According to this application example, by emphasizing the intensity of light in the vertical direction of the container surface, it is possible to emphasize the outline of defects such as thin bubbles whose outline is unclear.

[Application example 4 ]
In the container inspection device according to this application example
The light limiting unit is a first light limiting unit arranged at a position corresponding to a region below a predetermined height position in the vertical direction of the container.
A second light limiting unit that reduces the amount of light transmitted from the light emitting unit is further included on the container side of the light emitting unit at a position corresponding to a region above the predetermined height position.
The second light limiting unit can be arranged at a predetermined interval in the horizontal direction.

According to this application example, by inspecting the lower region of the container where defects such as thin bubbles with unclear contours are likely to occur and the upper region where such defects are less likely to occur with different optical systems. , The influence of uneven meat and seams can be eliminated, the outline of defects such as thin bubbles can be easily drawn, and the load of image processing can be suppressed.

[Application example 5 ]
In the container inspection device according to this application example
The determination unit recognizes at least one detection body from the captured image, and sets a vertical inspection region extending in the vertical direction and a horizontal inspection region extending in the horizontal direction in a predetermined range including the recognized detection body. However, when two or more detectors are included in the vertical inspection area and the horizontal inspection area, it can be determined as a defect.

According to this application example, it can be determined that the detector whose contour is divided into a plurality of parts and recognized is also a defect.

[Application example 6 ]
In the container inspection device according to this application example
The determination unit recognizes at least one detection body from the captured image, and when the shape of the recognized detection body is a detection body connected in a ring shape or an arc-shaped detection body, the defect is based on the area related to the detection body. Can be determined.

According to this application example, a detector having an annular contour or a detector having an arcuate contour can also be determined as a defect.

[Application example 7 ]
In the container inspection device according to this application example
The determination unit recognizes at least one detector from the captured image, and determines that it is a defect when a portion having a brightness equal to or higher than a predetermined threshold is included in a predetermined range including the recognized detector. can do.

According to this application example, even a detector including a bright outline and a dark outline can be determined as a defect.

[Application example 8 ]
The method of inspecting the container according to this application example is
Dimming that limits the incident angle of light from the light emitting part with respect to the vertical direction by means of light emitted from the light emitting part and passing through a light transmitting part having a width of 3 mm to 6 mm in the vertical direction and a blind extending in the horizontal direction. The light that has passed through the part is alternately irradiated toward the container in the vertical direction.
An image of the container is imaged by an imaging unit arranged so as to face the light emitting unit across the container.
Including the step of judging the bubbles on the inner surface of the container as defects .
A plurality of the blinds are arranged in the vertical direction.
The width of the light transmitting portion in the vertical direction is wider than the distance between the blinds adjacent to each other in the dimming portion .

According to this application example, it is possible to inspect the presence or absence of defects such as thin bubbles with unclear contours due to changes in the brightness of the container surface in the vertical direction due to the light transmitting portion and the dimming portion. According to this application example, it is possible to recognize the shadow of the contour of a defect such as a thin bubble having an unclear contour.

The present invention can provide a container inspection apparatus and inspection method capable of inspecting the presence or absence of defects such as thin bubbles having an unclear outline.

FIG. 1 is a side view of a container inspection device. FIG. 2 is a front view of the light emitting unit, the first light limiting unit, and the second light limiting unit. FIG. 3 is a diagram showing the container and its image side by side. FIG. 4 is an enlarged cross-sectional view of the thin foam. FIG. 5 is an enlarged view of A in FIG. FIG. 6 is a diagram illustrating an aspect of the contour of thin bubbles in the captured image. FIG. 7 is a diagram illustrating an inspection mode in the determination unit. FIG. 8 is a flowchart of a container inspection method.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the embodiments described below do not unreasonably limit the contents of the present invention described in the claims. Moreover, not all of the configurations described below are essential constituent requirements of the present invention.

The container inspection device according to the present embodiment has a light emitting unit having a light emitting surface that irradiates the container with light, an imaging unit arranged so as to face the light emitting unit with the container sandwiched between the light emitting units, and the imaging unit. The light limiting unit includes a determination unit for determining the presence or absence of defects based on an image of the container and a light limiting unit arranged on the container side of the light emitting unit, and the light limiting unit extends in the horizontal direction along the light emitting surface. The light transmitting portion and the dimming portion include a light transmitting portion and a dimming portion, and the light transmitting portion and the dimming portion are alternately arranged in the vertical direction, and the light transmitting portion transmits the light emitted from the light emitting portion to the container side. the dimming portion, said a plurality of blind extending in the horizontal direction to the vertical direction, among the light emitted from the light emitting portion, to limit the incidence angle of light with respect to the vertical direction, the light transmission unit The vertical width of the above is 3 mm to 6 mm, and is wider than the distance between the blinds adjacent to each other in the dimming portion .

1. 1. Outline of the container inspection device The outline of the container 10 inspection device 1 will be described with reference to FIGS. 1 to 3. FIG. 1 is a side view of the inspection device 1 (hereinafter referred to as “inspection device 1”) of the container 10, and FIG. 2 is a front view of the light emitting unit 20, the first light limiting unit 24, and the second light limiting unit 26. FIG. 3 is a diagram showing the container and its image side by side.

As shown in FIGS. 1 to 3, the inspection device 1 includes a light emitting unit 20 having a light emitting surface 22 that irradiates the container 10 with light, and an imaging unit arranged so as to face the light emitting unit 20 with the container 10 interposed therebetween. 40, a determination unit 52 for determining the presence or absence of defects based on the image 80 (FIG. 3) of the container 10 imaged by the image pickup unit 40, and a first light limiting unit 24 arranged on the container 10 side of the light emitting unit 20. ,including.

The first light limiting unit 24 is arranged at a position corresponding to the region 13a below the predetermined height position H1 (FIG. 3) in the vertical direction Y of the container 10. The inspection device 1 can further include a second light limiting unit 26. The second light limiting unit 26 is arranged at a position on the container 10 side of the light emitting unit 20 and corresponding to the region 13b above the predetermined height position H1. The lower region 13a of the container where defects such as thin bubbles with unclear contours are likely to occur and the upper region 13b where such defects are less likely to occur are different optical systems (first light limiting unit 24 and second). By inspecting with the light limiting unit 26), it is possible to eliminate the influence of uneven meat and seams, make it easier to outline defects such as thin bubbles, and suppress the load of image processing. Therefore, if the load of the control unit 50 does not matter, the first light limiting unit 24 may be arranged so as to correspond to the entire container 10. The drawbacks will be described later.

Here, as shown in FIG. 1, the container 10 is inspected in an upright state, that is, in a state where the axis 12 is along the vertical direction Y. The vertical direction Y is the direction of gravity, and the horizontal direction X is the direction orthogonal to the vertical direction Y.

The inspection device 1 includes a rotation support portion 30 that supports the container 10 while rotating it around the axis 12, and a side roller 32 that rotates the container 10 while contacting the side surface of the container 10. Although the side roller 32 is shown to be between the container 10 and the imaging unit 40 in FIG. 1, it is for convenience to explain the side roller 32, and the side roller 32 is a container 10 in the imaging unit 40. It is placed in a position that does not interfere with shooting.

The container 10 is a glass bottle and is transparent or translucent. The translucency is such that the defect of the inner surface 15 of the container 10 can be determined by the light from the light emitting unit 20 that has passed through the container 10. The container 10 has, for example, a circular cross section. The cross-sectional shape of the container 10 may be polygonal.

The predetermined height position H1 differs depending on the type of the container 10 and the state of molding. The predetermined height position H1 may be a so-called settle line. The settle line is a portion whose wall thickness changes, which is formed at the boundary between the portion in contact with the mold and the portion in contact with the mold by the settle blow for forming the mouth portion. The settle line can be formed in the horizontal direction X of the container 10. The predetermined height position H1 can be set at the boundary between the lower region 13a of the container 10 where the thin bubbles 18 are likely to be generated and the upper region 13b of the container 10 where the thin bubbles 18 are unlikely to be generated.

The inspection device 1 uses the light transmitted through the container 10 to image the body 13 of the container 10 with the imaging unit 40, and detects a portion darker than the surroundings as a detector in the container 10 in the captured image 80 (FIG. 3). This is a light transmission type inspection device 1.

2. 2. Disadvantages The defects to be detected by the inspection device 1 will be described with reference to FIGS. 3 and 4. FIG. 4 is an enlarged cross-sectional view of the thin foam 18. In FIG. 4, the amount of light transmitted is represented by the thickness of the arrow.

As shown in FIG. 3, when the body portion 13 of the container 10 is imaged by the imaging unit 40, the image 80 is obtained. In the image 80, for example, the seam 16, the thin foam 18, and the meat unevenness 19 can be confirmed as detectors. The seam 16 is not a defect, but the step of the seam of the mold for molding the container 10 appears in the image 80 as a dark line along the vertical direction Y. The thin foam 18 is a drawback that rarely occurs at a position below the predetermined height position H1 of the container 10. The meat unevenness 19 is not a defect, but a dark part that appears due to a change in the wall thickness of the body portion 13 of the container 10. In addition, there are drawbacks such as burning.

The thin bubbles 18 may be generated on the inner surface 15 of the container 10 below the predetermined height position H1 of the container 10. The thin bubbles 18 are generated due to the difference in the ease of elongation due to the temperature difference of the parison in the molding process of the container 10. The thin foam 18 is a hollow foam having an extremely shallow recess (for example, a depth of 100 μm or less from the inner surface 15), and has a substantially circular contour. Therefore, in the image 80, the outline of the thin bubble 18 appears slightly darker than the surroundings, but it is usually difficult to distinguish because the brightness is about the same as that of the seam 16 and the uneven meat 19. The inspection device 1 must be able to discriminate between the thin foam 18 and a portion that is not a defect such as a seam 16 or a meat unevenness 19.

However, if only a conventional filter as in Patent Document 1 is used, when trying to detect the thin bubbles 18, the seam 16 may be determined as a defect, and the container 10 which is originally a good product may be excluded as a defective product. The method of Patent Document 2 is also the same. This is because the change in brightness between the thin bubbles 18 and the surroundings is small, and there is not much difference in brightness between the thin bubbles 18 and the seam 16 which is not a defect.

3. 3. Light emitting unit The light emitting unit 20 will be described with reference to FIGS. 1 and 2.

As shown in FIGS. 1 and 2, the light emitting unit 20 is a light source that illuminates the container 10. The light emitting unit 20 is a surface light source having a light emitting surface 22 on the container 10 side and capable of illuminating the container 10 from the opposite side of the imaging unit 40. The light emitting unit 20 is set to a size capable of illuminating the entire maximum container 10 scheduled to be inspected by the inspection device 1.

As shown in FIG. 2, in the light emitting unit 20, the light emitting surface 22 on the container 10 side has a rectangular shape, and almost the entire surface thereof emits light. The light emitting unit 20 faces the container 10 and the imaging unit 40, and is arranged so that the light transmitted through the container 10 reaches the imaging unit 40.

As the light source of the light emitting unit 20, for example, a known light source such as an LED or an organic EL can be used. The light emitting unit 20 is diffused illumination, and when an LED is used, a diffuser plate can be used to irradiate the container 10 with uniform light on the front surface (light emitting surface 22) of the light source. As the diffuser plate, a known one that diffuses the light from a light source such as an LED and emits it to the outside can be used. By diffusing the light by the diffuser plate, it is possible to reduce the unevenness with the portion where the light source does not exist when a large number of light sources are used.

A light limiting unit is provided on the light emitting surface 22.

4. The first light limiting unit 24 and the second light limiting unit 26, which are the light limiting units, will be described with reference to FIGS. 1, 2 and 5. In FIG. 2, the container 10 shown by the broken line is for explaining the positional relationship between the first light limiting unit 24 and the second light limiting unit 26. FIG. 5 is an enlarged view of A in FIG.

4-1. First Light Restriction Unit As shown in FIGS. 1, 2 and 5, the first light restriction unit 24 is located at a position corresponding to a region 13a below a predetermined height position H1 (FIG. 3) in the vertical direction of the container 10. Is placed in. This is to reliably detect the thin bubbles 18 that tend to be generated below the container 10. The first light limiting unit 24 includes a light transmitting unit 244 and a dimming unit 242 extending in the horizontal direction X along the light emitting surface 22. In the first light limiting unit 24, the light transmitting unit 244 and the dimming unit 242 are alternately arranged in the vertical direction Y. This is because the first light limiting unit 24 transmits the light diffused in the horizontal direction X from the light emitting surface 22 toward the container 10 and is transmitted, and is diffused in the vertical direction Y to limit the emitted light.

The light transmitting unit 244 transmits the light emitted from the light emitting unit 20. The light transmitting portion 244 is a slit. The light transmitting portion 244 has nothing to block the light of the light emitting surface 22. In order to eliminate the shadow of the seam 16, the container 10 can be illuminated with sufficient horizontal light transmitted through the light transmitting portion 244.

As shown in FIG. 5, the dimming unit 242 includes a plurality of blinds 243 extending in the horizontal direction X in the vertical direction Y, and among the light emitted from the light emitting unit 20, the incident angle of the light with respect to the vertical direction Y. Restrict. The blind 243 is formed so as to extend in the horizontal direction X and the thickness direction of the dimming portion 242. Of the diffused light on the light emitting surface 22, the light along the blind 243 is preferentially transmitted by the dimming unit 242. Therefore, the diffused light of the light emitting surface 22 is narrowed down by the dimming unit 242, and the transmission of the light diffused in the vertical direction Y is particularly limited. The blind 243 extends in a direction orthogonal to, for example, the light emitting surface 22. Therefore, the dimming unit 242 preferentially transmits the light emitted from the light emitting surface 22 in the horizontal direction X.

As described above, the change in the brightness of the inner surface 15 of the container 10 by the light transmitting portion 244 and the dimming portion 242 in the vertical direction Y is as a striped pattern having a gradual change in brightness as shown in the image 80 of FIG. appear. Then, by the change in the brightness in the vertical direction Y, defects such as thin bubbles 18 having an unclear outline can be confirmed in the image 80, and the presence or absence of the defects can be determined in the inspection device 1.

Further, since the light diffused in the horizontal direction X sufficiently reaches the container 10 by the light transmitting portions 244 and the dimming portions 242 alternately arranged in the vertical direction Y, the dark seam 16 caused by the step in the horizontal direction in the image 80 Is less likely to appear (the change in brightness becomes smaller). If the wall thickness unevenness 19 also appears as a change in the wall thickness in the horizontal direction, it is less likely to appear as a dark portion in the image 80 (the change in brightness becomes small).

The dimming unit 242 is arranged on the light emitting surface 22 of the light emitting unit 20, and the height from the light emitting surface 22 is 0 mm to 100 mm. By having the dimming portion 242 having a predetermined thickness, it is possible to suppress the shadow of the seam 16 and emphasize the shadow of defects such as the thin bubble 18 having an unclear outline in the image 80 to be captured. it can. The height of the dimming unit 242 from the light emitting surface 22 can be further 0 mm to 100 mm.

The dimming unit 242 is formed by stacking a plurality of light control films. By emphasizing the intensity of light in the vertical direction Y of the inner surface 15 of the container 10, it is possible to emphasize the outline of defects such as thin bubbles 18 having an unclear outline. FIG. 5 shows an example in which two light control films having a thickness of 0.5 mm are laminated and laminated in the thickness direction. As the light control film, a commercially available one can be used. For example, "LIGHT CON FILM 60DEG 12x11" manufactured by 3M Co., Ltd. can be adopted.

The width of the light transmitting portion 244 in the vertical direction Y can be 3 mm to 6 mm. This width was an appropriate width for recognizing the shadow of the contour of a defect such as the thin bubble 18 whose contour is unclear when the inventors and others inspected a wide variety of samples of the thin bubble 18.

In the image processing unit 53 described later, the portion corresponding to the lower region 13a in the image 80 is subjected to the difference processing in the horizontal direction X and the difference processing in the vertical direction Y, so that the striped pattern by the dimming unit 242 and the light transmitting unit 244 is performed. , The dark part of the seam 16 and the uneven meat 19 can be removed, and the shadow of the outline of the thin bubble 18 can be left.

As shown in FIG. 2, the first light limiting unit 24 is a dimming unit by providing a plurality of slits (three in FIG. 2) at predetermined intervals on a thin sheet in which two light control films are laminated. 242 and the light transmitting portion 244 are provided alternately. The first light limiting unit 24 is provided with elongated holes 246 extending in the vertical direction Y at both ends in the width direction (horizontal direction X), and is fixed to the light emitting unit 20 by bolts 28. The first light limiting unit 24 can move in the vertical direction Y along the elongated hole 246, and its position can be adjusted according to the height of the container 10.

4-2. Second Light Restriction Unit As shown in FIG. 2, two second light restriction units 26 are arranged at positions corresponding to the region 13b above the predetermined height position H1 at predetermined intervals. This is because a very shallow thin bubble 18 such as the lower region 13a does not occur. The second light limiting unit 26 may be connected or integrally formed as long as it has a predetermined interval capable of transmitting the light from the light emitting unit 20.

The two second light limiting units 26 reduce the amount of light transmitted from the light emitting unit 20. The two second light limiting portions 26 are arranged at predetermined intervals in the horizontal direction X. Since the bubbles on the inner surface 15 generated in the upper region 13b are not extremely shallow thin bubbles 18, they can also be detected by the structure of the second light limiting unit 26. The predetermined interval in the horizontal direction X is narrower than the width of the region 13b above the body portion 13 in the horizontal direction X. In the image processing unit 53, which will be described later, the dark portion of the seam 16 and the meat unevenness 19 can be removed by performing the difference processing in the vertical direction Y on the portion corresponding to the upper region 13b in the image 80.

A light-shielding plate can be used for the second light limiting unit 26. As the light-shielding plate, a thin metal plate, for example, an iron plate can be used.

The second light limiting unit 26 is fixed to the light emitting unit 20 with a bolt 28 at the end of the light emitting unit 20 in the horizontal direction X. The second light limiting unit 26 has two elongated holes 264 at the top and bottom, can move in the vertical direction Y by loosening the bolt 28, and can adjust the position according to the height of the container 10.

5. Rotational Support As shown in FIG. 1, the rotary support 30 and the side rollers 32 rotate the container 10 around the axis 12. The rotation support portion 30 supports the bottom portion 14 of the container 10. The axis 12 is a virtual line that serves as a rotation center axis around which the container 10 rotates.

The rotation support portion 30 may be a member for transporting the container 10 to a predetermined position to be inspected shown in FIGS. 1 and 2 while supporting the container 10. In that case, the container 10 is sequentially and intermittently conveyed to a predetermined position to be inspected by the rotation support portion 30, and the container 10 is rotated around the axis 12 when the container 10 is arranged at the predetermined position.

The rotation support unit 30 transmits the driving force of the motor 60 to the rotation support unit 30 and the side rollers 32 via the belt 35 or the like according to the command of the rotation control unit 62, and rotates. When the container 10 is conveyed to the position to be inspected, the rotation support portion 30 rotates at a predetermined speed by a predetermined amount. A predetermined amount of rotation is sufficient to image the entire circumference of the container 10. The predetermined amount of rotation is set to 1.2 rotations or more so that the entire detection body can be grasped by one image data. The rotation amount of the rotation support unit 30 is calculated by the control unit 50 based on the output of the rotation detection unit 54. The rotation detection unit 54 can be a rotary encoder directly or indirectly attached to the motor 60.

6. Imaging unit As shown in FIG. 1, the imaging unit 40 is arranged so as to face the light emitting unit 20 with the container 10 interposed therebetween. The imaging unit 40 is arranged so as to photograph the surface of the container 10 on the axis 12. The imaging unit 40 can photograph at least the inspection target portion of the container 10, and here, the entire vertical direction Y of the body portion 13 of the container 10 is arranged so as to be within the field of view of the imaging unit 40.

The imaging unit 40 can capture an image including a detector (including thin bubbles 18) by the light of the light emitting unit 20 transmitted through the container 10. As the imaging unit 40, for example, a known line sensor camera can be used. The image pickup unit 40 takes an image according to the rotation speed of the rotation support unit 30 by the output of the rotation detection unit 54, so that the image 80 is not affected even if the rotation speed changes for some reason.

The image pickup unit 40 photographs the entire circumference of the body portion 13, sends the data to the image processing unit 53 of the control unit 50, and performs predetermined processing on the image 80. As shown in FIG. 3, in the image 80 before image processing, a striped pattern extending in the horizontal direction X appears in a portion corresponding to the region 13a below the body portion 13. This is the effect of the dimming section 242 and the light transmitting section 244 of the first light limiting section 24 shown in FIGS. 1 and 2.

In the portion corresponding to the lower region 13a in the image 80, the first light limiting unit 24 irradiates the body 13 with a large amount of light diffused in the horizontal direction X, and the light diffused in the vertical direction Y is below the body 13. Since the area 13a is restricted from hitting the area 13a, the shadow of the seam 16 hardly appears in the image 80. The seam 16 and the meat unevenness 19 in the upper region 13b corresponding to the second light limiting unit 26, which does not have a structure like the first light limiting unit 24, appear in the image 80.

The image processing unit 53 performs a known gradation conversion process in the vertical direction Y so as to erase the striped pattern by the first light limiting unit 24 on the image 80, and the seam 16 and the meat unevenness 19 in the upper region 13b are formed. A known gradation conversion process in the horizontal direction X can be performed so as to eliminate the shadow. As the gradation conversion process, for example, a shading correction process, a process of performing gradation conversion based on a difference from a reference image, a dynamic threshold method (dynamic binarization process), or the like can be adopted. As the gradation conversion process, for example, KEYENCE's real-time shading correction can be adopted. Real-time shading correction refers to correcting a change in background brightness of image data that may occur due to the lighting state of the container 10 to be inspected. For example, when there is unevenness in brightness such that the portion corresponding to the bottom portion 14 in the image 80 is darker than the body portion 13, real-time shading correction is used to correct the entire image so that the brightness is uniform on average.

Therefore, the presence or absence of the thin foam 18 can be detected more accurately while accurately distinguishing the thin foam 18 from the seam 16 and the uneven meat 19.

7. Judgment unit As shown in FIG. 1, the determination unit 52 is a part of the control unit 50. Therefore, the control unit 50 instructs the subsequent processing of the inspected container 10 according to the determination result of the determination unit 52. The determination unit 52 may be provided separately from the control unit 50. In that case, the determination result of the determination unit 52 is notified to the control unit 50.

The determination unit 52 will be described in more detail with reference to FIGS. 6 and 7. FIG. 6 is a diagram for explaining aspects of the contours 18a to 18d of the thin bubbles 18 in the captured image, and FIG. 7 is a diagram for explaining an inspection mode in the determination unit 52. 6 and 7 are contours 18a to 18d of the thin bubbles 18 after the image 80 of FIG. 3 is subjected to the difference processing in the vertical direction Y and the horizontal direction X by the image processing unit 53.

As a result of inspecting a large number of containers 10, it was confirmed that there are four types of contours 18a to 18d. FIG. 6 schematically shows an annular contour 18a, a divided contour 18b, an arcuate contour 18c, and a bright portion 18d. The determination unit 52 has an inspection method for recognizing four types of contours 18a to 18d as defects (thin bubbles 18).

Based on the image data after the image processing, the determination unit 52 recognizes a portion darker than the surroundings as a detection body, for example, depending on the shade of brightness, and performs all the following determination processing for each of the detection bodies. Then, the container 10 determined by the determination unit 52 to have a defect is determined as a defective product, and the control unit 50 guides the container 10 to the discharge line.

7-1. Circular contour The annular contour 18a on the upper left of FIG. 6 is a detector in which the recognized shapes of the detectors are connected in a ring shape. As shown in FIG. 7, the determination unit 52 recognizes at least one detection body from the captured image 80 (FIG. 3), and detects when the shape of the recognized detection body is a ring-shaped detection body. It can be determined as a defect based on the area related to the body. By making such a determination, the detector having the annular contour 18a can be determined as a defect, and the container 10 having the defect can be determined as a defective product.

When the detector has an annular contour 18a, an inspection region 81 including all the annular contours 18a is set, and is surrounded by the area of the annular contour 18a inside the inspection region 81 and the annular contour 18a. When the total area including the area of the range is equal to or greater than a predetermined threshold value, it is determined that the annular contour 18a is a defect, and the container 10 is determined to be a defective product. When it is judged whether or not it is a defect (thin bubble) only by the area of the annular contour 18a, it can be determined that even a detector having a small area based on the meat unevenness 19 or the like remaining even after image processing is a defect. Therefore, this is to prevent this.

7-2. Divided contours The two types of divided contours 18b in the middle of FIG. 6 are detectors in which the recognized shape of the detector is divided into a plurality of recognized bodies. The divided contour 18b on the left side is divided into two, and the divided contour 18b on the right side is divided into four. If it is divided in this way, it cannot be recognized as an annular contour 18a, so a process different from that of 7-1 is required.

As shown in FIG. 7, the determination unit 52 recognizes at least one detection body (divided contour 18b) from the captured image 80 (FIG. 3), and is vertically within a predetermined range including the recognized detection body. A vertical inspection area 82 extending in the direction Y and a horizontal inspection area 84 extending in the horizontal direction X are set, and two or more detectors (divided contours 18b) are included in the vertical inspection area 82 and the horizontal inspection area 84. In some cases, it can be determined to be a defect. A detector whose contour is divided into a plurality of parts and recognized can also be determined to be a defect.

The vertical inspection region 82 is set, for example, so that the width of the horizontal direction X matches the width of the horizontal direction X of one divided contour 18b, and the height of the vertical direction Y is such that three divided contours 18b are lined up. It is set according to the height.

The horizontal inspection region 84 is set so that the height in the vertical direction Y is set according to one divided contour 18b, and the width in the horizontal direction X is set according to the width in which three divided contours 18b are arranged.

7-3. Arc-shaped contour The arc-shaped contour 18c on the lower left side of FIG. 6 is a detector whose recognized shape is arc-shaped. Such an arcuate contour 18c requires a different treatment from the above 7-1 and the above 7-2.

As shown in FIG. 7, the determination unit 52 recognizes at least one detection body from the captured image 80 (FIG. 3), and when the shape of the recognized detection body is an arc-shaped detection body, the detection body ( It can be determined as a defect based on the area relating to the arcuate contour 18c). By making such a determination, the detector having the arcuate contour 18c can be determined as a defect, and the container 10 having the defect can be determined as a defective product.

When the detector has an arcuate contour 18c, an external inspection area 85 circumscribing the arcuate contour 18c is set, and the area ratio of the area of the arcuate contour 18c to the area of the external inspection area 85 is equal to or greater than a predetermined threshold value. In the case of, it is determined that the arcuate contour 18c is a defect, and the container 10 is determined as a defective product. When it is judged whether or not it is a defect (thin bubble) only by the area of the arcuate contour 18c, it can be determined that even a detector having a small area based on the meat unevenness 19 or the like remaining even after image processing is a defect. Therefore, this is to prevent this.

7-4. Bright portion The bright portion 18d on the lower right side of FIG. 6 is a portion having a brightness equal to or higher than a predetermined threshold value near the detector (for example, the annular contour 18a).

As shown in FIG. 7, the determination unit 52 recognizes at least one detector (for example, the annular contour 18a) from the captured image 80 (FIG. 3), and within a predetermined range including the recognized detector. When a portion having a brightness equal to or higher than a predetermined threshold value (bright portion 18d) is included, the container 10 can be determined to be a defect. Even a detector including a bright outline and a dark outline can be determined as a defect. There is only a dark part such as dirt, but in the case of a shape like the thin bubble 18, it may have a bright part 18d, so that even if the outline of the thin bubble 18 is small, it can be recognized as the thin bubble 18.

The type of the detector may be a divided contour 18b or an arcuate contour 18c.

8. Inspection method In the inspection method of the container 10 according to the present embodiment, the light emitted from the light emitting portion 20 and passing through the light transmitting portion having a width of 3 mm to 6 mm in the vertical direction and the blind 243 extending in the horizontal direction X are used in the vertical direction. The light that has passed through the dimming unit 242 that limits the incident angle of the light from the light emitting unit 20 with respect to Y is alternately irradiated toward the container 10 in the vertical direction Y, and the light emitting unit 20 sandwiches the container 10. The image 80 of the container 10 is imaged by the imaging units 40 arranged to face each other, and the step of determining the bubbles on the inner surface 15 of the container 10 as defects is included, and a plurality of the blinds are arranged in the vertical direction, and the light The width of the transmitting portion in the vertical direction is wider than the distance between the blinds adjacent to each other in the dimming portion .

According to the inspection method of the container 10, the presence or absence of a detector such as a thin bubble 18 having an unclear outline can be inspected by the change in the brightness of the container surface in the vertical direction due to the light transmitting portion and the dimming portion.

An inspection method using the inspection apparatus 1 will be described with reference to FIGS. 1 to 8. FIG. 8 is a flowchart of an inspection method for the container 10.

S10: The control unit 50 issues a command to the rotation control unit 62 to drive the motor 60, and rotates the rotation support unit 30 and the side roller 32 at a predetermined speed. Due to the rotation of the rotation support portion 30 and the side roller 32, the container 10 conveyed to the inspection position starts rotating about the axis 12.

S20: The control unit 50 commands the image pickup unit 40 to start imaging. The imaging unit 40 calculates the rotation angle of the container 10 based on the output from the rotation detection unit 54 according to the command of the control unit 50, and photographs the entire circumference of the body unit 13.

S30: The control unit 50 instructs the image processing unit 53 to store the image 80 in a storage unit (not shown). The image processing unit 53 stores at least one image 80 of the container 10 (for example, 1.5 times).

S40: The control unit 50 causes the determination unit 52 to determine the presence / absence of the detector in the stored image 80. As a result of the determination, if there is no detector in the image 80, the processing of the determination unit 52 is completed, and the container 10 is conveyed to the next step as a non-defective product. If the image 80 has a detector as a result of the determination, the following four inspection algorithms are executed.

S50 (first inspection algorithm): When the determination unit 52 recognizes at least one detection body from the captured image 80, and the shape of the recognized detection body is a detection body (annular contour 18a) connected in a ring shape. In addition, the detector is determined to be a defect based on the area of the detector. The details of the inspection will be omitted because they have been described in 7-1 above.

S60 (second inspection algorithm): The determination unit 52 recognizes at least one detection body (divided contour 18b) from the captured image 80, and vertically Y in a predetermined range including the recognized detection body. A vertical inspection area 82 extending and a horizontal inspection area 84 extending in the horizontal direction X are set, and when two or more detectors (divided contours 18b) are included in the vertical inspection area 82 and the horizontal inspection area 84, The detector is judged to be a defect. The details of the inspection have been described in 7-2 above and will be omitted.

S70 (third inspection algorithm): The determination unit 52 recognizes at least one detection body from the captured image 80 (FIG. 3), and when the shape of the recognized detection body is an arc-shaped detection body, the detection body The detector is determined to be defective based on the area relative to (arc contour 18c). The details of the inspection will be omitted because they have been described in 7-3 above.

S80 (fourth inspection algorithm): The determination unit 52 recognizes at least one detector (for example, an annular contour 18a) from the captured image 80, and sets a predetermined threshold within a predetermined range including the recognized detector. When a portion having a brightness equal to or higher than the value (bright portion 18d) is included, the detector is determined to be a defect. The details of the inspection will be omitted because they have been described in 7-4 above.

S90: When the determination unit 52 determines in any of the first inspection algorithm to the fourth inspection algorithm that the detector is a defect, the discharge process (S100) is executed, and when the detector is determined not to be a defect. Terminates the processing of the determination unit 52, and the control unit 50 conveys the container 10 to the next step.

S100: The defective container 10 determined by the control unit 50 to have a defect is discharged from a discharge unit (not shown) different from the transport path to the next step.

The present invention is not limited to the above-described embodiment, and various modifications are possible. For example, the present invention includes substantially the same configurations as those described in the embodiments (eg, configurations with the same function, method, and result, or configurations with the same purpose and effect). The present invention also includes a configuration in which a non-essential part of the configuration described in the embodiment is replaced. The present invention also includes a configuration that exhibits the same effects as the configuration described in the embodiment or a configuration that can achieve the same object. The present invention also includes a configuration in which a known technique is added to the configuration described in the embodiment.

1 ... Inspection device, 10 ... Container, 11 ... Mouth, 12 ... Axial line, 13 ... Body, 13a ... Lower area, 13b ... Upper area, 14 ... Bottom, 15 ... Inner surface, 16 ... Seam, 18 ... thin bubbles, 18a ... annular contour, 18b ... divided contour, 18c ... arcuate contour, 18d ... bright part, 19 ... uneven meat, 20 ... light emitting part, 22 ... light emitting surface, 24 ... first light limiting part , 242 ... dimming part, 243 ... blind, 244 ... light transmitting part, 246 ... long hole, 26 ... second light limiting part, 264 ... long hole, 28 ... bolt, 30 ... rotary support part, 32 ... side roller, 35 ... belt, 40 ... imaging unit, 50 ... control unit, 52 ... judgment unit, 53 ... image processing unit, 54 ... rotation detection unit, 60 ... motor, 62 ... rotation control unit, 80 ... image, 81 ... inspection area, 82 ... Vertical inspection area, 84 ... Horizontal inspection area, 85 ... External inspection area, H1 ... Predetermined height position, H2 ... Height, W ... Width

Claims (8)

A light emitting part having a light emitting surface that irradiates the container with light,
An imaging unit arranged so as to face the light emitting unit with the container in between,
A determination unit that determines the presence or absence of defects based on the image of the container captured by the imaging unit, and
A light limiting unit arranged on the container side of the light emitting unit and
Including
The light limiting portion includes a light transmitting portion and a dimming portion extending in the horizontal direction along the light emitting surface.
The light transmitting portion and the dimming portion are alternately arranged in the vertical direction.
The light transmitting unit transmits the light emitted from the light emitting unit to the container side, and the light transmitting unit transmits the light emitted from the light emitting unit to the container side.
The dimming unit includes a plurality of blinds extending in the horizontal direction in the vertical direction, and limits the incident angle of the light emitted from the light emitting unit with respect to the vertical direction .
An inspection device for a container , wherein the width of the light transmitting portion in the vertical direction is 3 mm to 6 mm, and is wider than the distance between the blinds adjacent to each other in the dimming portion . In claim 1,
The container inspection device, wherein the dimming portion is arranged on a light emitting surface of the light emitting portion, and the height from the light emitting surface is 0 mm to 100 mm. In claim 1 or 2 ,
The dimming unit is a container inspection device, which is formed by stacking a plurality of light control films. In any one of claims 1 to 3 ,
The light limiting unit is a first light limiting unit arranged at a position corresponding to a region below a predetermined height position in the vertical direction of the container.
A second light limiting unit that reduces the amount of light transmitted from the light emitting unit is further included on the container side of the light emitting unit at a position corresponding to a region above the predetermined height position.
A container inspection device, wherein the two second light limiting units are arranged at predetermined intervals in the horizontal direction. In any one of claims 1 to 4 ,
The determination unit recognizes at least one detection body from the captured image, and sets a vertical inspection region extending in the vertical direction and a horizontal inspection region extending in the horizontal direction in a predetermined range including the recognized detection body. However, a container inspection device, characterized in that, when two or more detectors are included in the vertical inspection region and the horizontal inspection region, it is determined as a defect. In any one of claims 1 to 5 ,
The determination unit recognizes at least one detection body from the captured image, and when the shape of the recognized detection body is a detection body connected in a ring shape or an arc-shaped detection body, the defect is based on the area related to the detection body. A container inspection device, which comprises determining that. In any one of claims 1 to 6 ,
The determination unit recognizes at least one detector from the captured image, and determines that it is a defect when a portion having a brightness equal to or higher than a predetermined threshold is included in a predetermined range including the recognized detector. A container inspection device, characterized in that it does. Dimming that limits the incident angle of light from the light emitting part with respect to the vertical direction by means of light emitted from the light emitting part and passing through a light transmitting part having a width of 3 mm to 6 mm in the vertical direction and a blind extending in the horizontal direction. The light that has passed through the part is alternately irradiated toward the container in the vertical direction.
An image of the container is imaged by an imaging unit arranged so as to face the light emitting unit across the container.
Including the step of judging the bubbles on the inner surface of the container as defects .
A plurality of the blinds are arranged in the vertical direction.
A method for inspecting a container, wherein the width of the light transmitting portion in the vertical direction is wider than the distance between the blinds adjacent to each other in the dimming portion .